Double acting book dbill



(No Model.)

H. G. WALKER. DUBLE A'TING ROCKDRILL.

No. 354,957'.A

PatentedDec. 28, 1886.

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UNTTED STATES PATENT @Erica HENRY GRANT WALKER, oE NEW YORK, N.Y.

DOUBLE-ACTING ROCK-DRlLL.

ESPECIEECATIEQN forming part of Letters Patent No. 354,957, dated December 28,1886.

Application filed March 16, 1886. Serial No. 195,390. (No model.)

To all whom, it may concern: Y

Be it known that l, HENRY GRANT WALKER, a citizen of the United States, and a resident of New York, in the .county and State of New York, have invented certain Improvements in DoubleActing Rock-Drills, of which the following is a specification.

My invention relates especially to devices employed for drilling rock, &c., and has for its object the provision of a drill which may be run by hand-power in an easy and effective manner.

To attain the desired end my invention consisls, essentially, in a main frame or case mounted upon an adjustable weighted tripod in the usual manner, in combination with two sleeves, .the opposite extremities whereof consist of cams. The sleeves are made to revolve by suitable mechanism in opposite directions when the driving-crank is turned. The abovementioned sleeves revolve upon a central sleeve wherein the drill shaft plays, said drill-shaft being preferably raised by themovement of the earn-surfaces over each other and forced downward both by gravity and by springs .encircling the drill-shaft; and my'invention also involves certain other novel and useful combinations or arrangements of parts and peculiarities of construction and operation, all of which will be hereinafter first fully described, and then pointed out in the claims.

In the drawings, Figure l is a side elevation of my improved double-acting drill, and Fig. 2 is a plan view thereof. Fig. 8 is avertical axial sectional view of the driving mechanism.

Like letters of reference, wherever they oc- I cur, indicate corresponding parts in all the figures.

A are thelegs of the tripod, made in the usual manner and bearing adjustable weights B, said legs being pivoted to the main frame at C.

Dy is a bevel gear-wheel mounted upon a sleeve, E, passing through a perforation in the top ofthe main frame. A flange, F, secured to wheel D, permits the same to revolve, while holding it against displacement.' Feathers G upon wheelD tinto grooves H,upon eachside of sleeve E,thus causing it to rotate with wheel D, while permitting a perpendicular movement. l The lower extremity of sleeve E is provided with two or more cams, e. Iisasleeve or cylinder extending through' the main frame and sleeve E. Located below sleeve E is a second sleeve, E', bearing aiixed bevel-wheel, D. The upper extremity of sleeve E also terminates in cams e.

K is a driving-crank attached to a shaft, L, extending through the main frame and bearing upon its inner extremityabevehwheel, M, the teeth whereof engage either directly with the bevel-wheels D and D', or with intermediate wheels, N, as in Fig. l.

vBy varying the size of wheels M and N the speed and power of the drill may be varied to suit the work to be performed.

Playing within the cylinder I is a drill-shaft, P, screwthreaded, as shown, and provided at the upper surface of the main frame wit-hva feednut, Q, bearing a projecting arm, R. An adjustable upright, S,aflix ed to the main frame,

drill-shaft is raised 'the arm is released,and the nut turns with the drill, the drill-shaft being turned, preferably, by friction contact of the sleeve E with the nut Q, or, as show'nin Fig. 2, by a feather, e2, upon the sleeve E, fitting into 'a groove, p,in the drill-shaft P. By raising or lowering upright piece S the turning of the nut maybe accurately regulated. T is a washer beneath nut Q, which receives the nut and prevents it striking sleeve E when the drill falls.

U is a spring, made in three sections, coiled about shaft P, said springs, together with the weight of the drill, regulating the stroke. I make this spring in three sections,in order that when one is worn out or broken it may be replacedwithout the expense of an entire new spring. XVashers s are located between the sections to insure a proper action. end of the spring bears against the upper end against a` milled nut, i2, placed on the thread of shaft P.

The drill is held in place by means of a bevelnut, p2, engaging with the lower extremity of shaft P, a jam-nut, W', engaging with nut p2 at its lower extremity. The cylinder lis perforated at Y, and the milled nut i2, playing upon shaft P, provides means for adjusting the tension of the spring.

When constructed and arranged in accordance with the foregoing description, the action The upperv engages with arm R when the drill is depressed, preventing the turning of the nut; but as the of the cylinder l at i', and the lower extremity IOO of my improved drill is as follows: When the crank is turned, the cani sleeves E and E are caused to revolve in opposite directions, the

upper sleeve being raised by such niovement,`

carrying the drill-shaft with it,gravity and the spring forcing the drill downward as the cams pass the point ofengagement. By varying the number of cams the power and number of strokes may be varied; but by my peculiar construction I am enabled to increase the number of strokes to each revolution lof the drivingshaft, greatly adding to the speed with which work may be performed. YV hen it is desired to raise the drill from the holeand prevent the operation of the cams, a wedge or block, V, is inserted, as illustrated in Fig. 1, permitting the free turning of the drill'shaft, and by holding the feed-nut the shaft will rise when the crank is turned.

Having now fully described my invention, what I claim as new therein, and desire to se cure by Letters Patent, is

1. In a rock-drill, the combination, with the supporting-frame and drill-shaft surrounded bya spring within the frame, ofthe two sleeves, the ends whereof are provided with cams, as set forth, said sleeves revolving in opposite directions through the medium ofthe driving mechanism connected therewith, snbstantiall y as shown and described.

2. The combination, with the supportingfranie wherein are located the wheels M and N, of the cam-Wheel bearing the fixed wheel, the cam-sleevehaving grooves wherewith feathers upon the wheel D engage, and the drill-shaft surrounded by a spring, U, Within the frame, substantially as shown and described.

3. The combination, with the supporting-v frame and driving mechanism, and the calnsleeves, of the drill-shaft, cylinder I, and spring U, surrounding the drill-shaft within the supporting-frame,arranged substantially as shown and described.

4. In a rock-drill of the character herein speeified,the combin ation, with the drill-shaft, of therspring U, made in sections, the end of the lower section bearing against a nut, il, and the end of the upper section against cylinder I, substantially as and for the uses and purpose shown and described.

5. A'donbleacting rock-drill consisting of a tripodA Vsupporting a main frame, two camsleeves revolving in said frame, as set forth, mechanism for driving said cam-sleeves, a screw-threaded drill-shaf t bearing afeed-regulating nut and passing through a cylinder whereon the cani-sleeves revolve, and a sectionalspringsurrounding thedrill-shaft within the cylinder, bearings being provided for said spring, the whole combined and arranged to operate substantially as shown and described.

In testimony of the foregoing specification I do hereby sign the same, in the city of New York, in the county and State of New York, this 2d day of March, A. D. 1886.

JAS. B. KILSHEIMER, JOHN MORRIS. 

